I. clin·ker ˈkliŋ-kər noun
Etymology: alteration of earlier klincard a hard yellowish Dutch brick
Date: 1641
1. : a brick that has been burned too much in the kiln
2. : stony matter fused together : slag
II. clink·er ˈkliŋ-kər noun
Etymology: clink (I)
Date: 1733
1. British : something first-rate
2.
a. : a wrong note
b. : a serious mistake or error : boner
c. : an utter failure : flop
d. : something of poor quality